The head of the carriage bolt is designed as a round shape without the design of a booster tool such as a cross slot or hexagonal socket, which serves as an anti-theft device during the actual connection process. In addition, the square neck of the carriage bolt can be stuck in the groove during the installation process, preventing the bolt from rotating and allowing it to move parallel in the groove. According to the size of the head, they can be categorized into large semi-circular head (corresponding to standards GB/T14 and DIN603) and small semi-circular head (corresponding to standards GB/T12-85). These bolts need to be used in conjunction with the nut, and do not connect individually. The tool is usually a wrench.
ABOUT USHANDAN SHENGDONGZE STAINLESS STEEL FASTENERS MANUFACTURING CO.,LTD is located in China's largest fasteners production base Yongnian fasteners centre.
PRODUCTSOur fasteners are manufactured using high quality stainless steel materials to ensure the strength,durability and reliability of our products. And our products are in line with international standards.
NEWSCold heading technology compliant with DIN/ASTM standards, producing A2-70/A4-80 stainless steel bolts & nuts with Grade 8.8 strength, salt spray testing exceeding 1,000 hours.
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地址：Southwest Development Zone Industrial Park, Yongnian District, Handan, Hebei, China
